This article is part of The PMHNP Guide to Addiction Psychiatry & Co-Occurring Disorders & Dual Diagnosis in Addiction Care, a clinical education series exploring how Psychiatric Mental Health Nurse Practitioners assess, diagnose, and treat substance use disorders using evidence-based, trauma-informed care.
PMHNPs often see patients who ask,
“Do I have anxiety… or withdrawal?”
“Is this depression… or is it the substance?”
The overlap is real, and a PMHNP is trained to tell the difference.
Time Course Matters
- Anxiety before daily drinking? → anxiety disorder
- Anxiety only in the mornings after heavy drinking? → withdrawal
- Depression only during stimulant crashes? → substance-induced depression
PMHNPs track symptoms independently of substance use patterns.
Biological Clues
- Tremors = alcohol/benzo withdrawal
- Dilated pupils = stimulant intoxication or opioid withdrawal
- Slowed speech = opioid intoxication
- Irritability + cravings = early recovery emotional dysregulation
These symptoms guide diagnosis.
Impact on Functioning
PMHNPs ask:
- “How much did this interfere before substances entered the picture?”
- “Are the symptoms worse when stopping or cutting back?”
Sobriety often reveals underlying mental health conditions.
Screening Tools Used
PMHNPs may collaborate with:
- DAST (substance use)
- CIWA (alcohol withdrawal)
- COWS (opioid withdrawal)
- GAD-7 (anxiety)
- PHQ-9 (depression)
- ASRS (ADHD)
Trauma vs. Addiction vs. ADHD — The Tricky Trio
A PMHNP can distinguish:
- ADHD impulsivity vs. stimulant crash irritability
- Trauma hypervigilance vs. benzodiazepine withdrawal anxiety
- Depression vs. alcohol-induced anhedonia
This nuance prevents misdiagnosis and inappropriate medications.
Integrated Treatment
A PMHNP always treats:
- the substance use
- the mental health condition
- the trauma underneath
Because if you only treat one, the other two drive relapse.
Substance use alters brain chemistry, sleep, mood, and stress responses, which can mimic anxiety, depression, ADHD, or trauma-related symptoms
PMHNPs assess symptom timing, physical signs, substance patterns, and standardized screening tools to determine whether symptoms are withdrawal-related or part of an anxiety disorder.
It occurs when symptoms such as depression, anxiety, or psychosis are caused or worsened by substance use or withdrawal rather than a primary psychiatric condition.
Yes. Many individuals have co-occurring disorders, which require simultaneous treatment of both conditions to reduce relapse risk.
Misdiagnosis can lead to inappropriate medications, worsened cravings, untreated withdrawal, and higher relapse risk.